Oidium lactis?

Dear mycologists:
I have a German article from 1893 that mentions the cell shape of the
organism Oidium lactis to be cylindric, rounded at the ends, and of
variable length. Please contact me if you know this organism (Is it a
bacterium or yeast?) or its current name, in case it changed. Where could
I find more information about it?
Thanks, ---Frans
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Frans Hochstenbach
fransh at Box-f.nih.gov